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352 + 4287 + 593 + 7684 + 9856 = 22772
An example of a card number is 3476 5467 9845 9856
46 = 4 x 4 x 4 x 4 x 4 x 4 = 4,096
x/(x + 4) = 4/(x + 4) + 2 (x - 4)/(x + 4) = 2 x - 4 = 2x + 8 -x = 12 x = -12